A system for displaying advertising content includes a client computer having a display device, a processor, a network interface, and a graphical user interface including a cursor. Chroma enhancement may be performed by selecting one of a plurality of chroma enhancement matrices, and converting a received color by multiplying it with the chroma enhancement matrix. Also described is a method for trigger point massage therapy, including measuring a pressure, adjusting the pressure, holding the pressure, rotatingunwinding, vibrating, and increasing the pressure. The system modifies the lines of code based on the one or more instructions; generates second code based on the first code and the modified lines of code; and outputs the second code. The light-emitting surface is adjacent to the first and second sides and formed with a plurality of v-shaped grooves and a flat portion. The pressure vessel can be sourced with positive andor negative pressure.